Sheet-metal rivet



R. w. HAYNES;

SHEET METAL RIVET. APPLICATION FILED SEPT- 1. 1920.

1,383,806. Patented July 5, 1921.

UNITED STATES,

PATENT OFFICE.

ROY w. HAYNES, OF PHILADELPHIA, PENNSYLVANIA, nssrcnon. 'ro 1mm RIVE'I CORPORATION, emu.

or PBIILADELPHIA, PENNSYLVANIA, A CORPORATION or vm SHEET-METAL RIVET. V

citizenof the United States, residing at Phil adelphia, in the county of Philadelphia and State of Pennsylvaniafhave invented an Improvement in Sheet-Metal Rivets, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to rivets and more particularly to a one piece sheet metal rivet large rounded heads are now commonly used,

to form the bottom stud rivets of traveling bags, where they serve to prevent the bottom of the bag from chafing against the floor; to form spots or knobs used to decorate har ness and dog collars, and for various other purposes where a large rounded metal head is desired.

Heretofore, this made from two separate pieces ofmetal, one a rounded cup part forming the head'of the rivet, and the other a separateshank'adapted to be riveted to the cup part or head. In order to construct these composite rivets, it has been customary to form the different parts on different machines, and thenassemble them, but this method of manufacturing the rivets consumes considerable time and labor.

The primary object of the present invention, therefore, is to provide a rivet of this general type which may be manufactured with more facility and less expense than the rivets heretofore produced.

The accompanying drawing illustrates a good practical form of the invention, the details of which may be modified within the true scope thereof as defined by the claims.

In the drawing:

Figure 1 is a plan view of a sheet metal blank from which the rivet is formed;

Fig. 2 is an enlarged perspective view of a partially completed rivet;

Fig. 3 is a perspective view of the completed rivet; and

Fig. 4 is a vertical sectional view taken through the completed rivet.

In the present invention the entire rivet is formed from a sheet metal blank, and in the embodiment of the invention shown in Fig. 1, this blank comprises a disk-like body por- Specification of Letters Patent. Application filed September 1, 1920. SeriaI No. 407,5 6 1.

type of rivet has been- Patented Jul s, 1921.

tion 10 having oppositely-extending, integral legs 11," and the outer endsof the legs 11 are preferably pointed somewhat as at 12.

The configuration of-this blank is such that it may be readily and inexpensively produced in large quantities. e

v The blank shown in Fig. 1 may be converted, by any suitable'means, into the partially completed rivet shown in Fig. 2.. In

this stage of development, the body portion 1Q has been given the dish or'cup shape shown with the legs ll-extending therefrom in substantially parallel relation. 1

' The partiallycompleted rivet of F ig. 2 is then converted into a completed rivet having the construction shown in F ig. 3. This is accomplished by bendingthe portion of the leg's-adjacentthe head 10 inwardly toward each other and into the cup or dish shaped head 10 as at 13. The legs 11 are preferably bent'inwardl-y at the point where they join the head 10, so that the bend indicated by 14;, will not extend beyond the plane of the marginal edge or rim 15 0f the cup. This is desirable in order that the marginal edge 15' throughout its entire extent including the bends of the legs 11, may rest firmly upon the surface to which the rivet is secured. The inwardly extending portions 18 of the legs are bent intosubstantial conformation with the concave'd inner surface of the head l0,

and may rest against the concaved surface in part at least. The remaining portion 16 of the legs 11 is bent outwardly to form prongs lying in close proximity to each other and extending from the head 10 at substantially rightangles to the plane of the marginal edge 15. r

' The portions 13 of the legs form bridge members extending from the marginal edge 15 of the head 10 to the inner end of the prongs l6, and since these bridge members rest against the inner curved face of the head, they form a firm base for the inner ends of the prongs 16. These prongs may be desirably stiffened throughout their lengths by bending them transversely. In the present instance they are bent to form an arc in transverse section with the marginal edges of one prong in close proximity to the corresponding edges of the other prong, so that the prongs may reinforce each other and together form a substantially tubular stud, as will be from the edge 15 to the inner end of the prong 16 has a curved portion or rounded bend formed at the juncture of the bridge member with the prong, and it should be noted that the transverse curve of the prong blends at this juncture into the rounded bend or curved portion. This construction, whereby one curve blends into another, serves materially to; increase the stability and stiffness of the prongs 16, for while the transverse curvature of the prongs stilfens them throughout their length, the merging of this curve with the bend at the base of the prongs substantially increases the stiffr ness of the bridge members and'prongs at this bend. As a result of this construction, the inner ends of the prongs 16 rest firmly upon'the inner curved surface of the head 10 and the prongs are supported by the bridge member 13 so that they project rigidly from the head 10.

From the foregoing description it will be apparent that the rivet forming the subjectmatter of this invention, may be readilyand inexpensively manufactured, and that the same is strong and durable.

What is claimed is 1. A one-piece sheet metal rivet having a hollow cupped head, legs integral with the outer marginal rim of the cupped head, each of said legs having a portion bent inwardly toward the center of the head and into the cupped. interior thereof to engage the concaved surface of the head, and having the remaining portion thereof bent to form a prong extending from the head at substantially a right angle to the plane of said rim, said rim constructed to rest throughout its periphery firmly upon the surface to which the rivet is secured.

2. A one-piece sheet metal rivet havinga hollow cupped head, legs integral with the outer marginal rim of the cupped head and having portions bent inwardly to lie entirely within the head and to abut against the concaved surface of the head near the center thereof, said legs having the remaining portions thereof extending from the interior of the cup outward in close proximity to each other to form prongs, said rim constructed to rest firmly upon the surface to which the rivet is secured with the inwardly bent portions of said legs out of engagement with said surface. 7

3. A one-piece sheet metal rivet-"having a hollow cupped head, legs formed upon and integral with the outer rim of the cupped head, said legs having portions *bent" inwardly towardeachother into the interior of the cupped head to abut against the inner concave surface of the head near the center thereof, and then bent to extend from the interiorof the head outward in close proximity to each other to form pron s, said inwardly bent portions forming bridges between the rim of the :cup ped head and the inner ends of vthe prongs and lying in their entirety between the inner concave surface of the head and they plane of the rim.

4. A one piece sheet metal rivet having a hollow crownedhead, legs formed upon and integral with the outer-edge portion of the head, said legs each having a portion bent to extend into the hollow head to .lie in'its entirety between the inner face .of the hollow head and the outer edge or rim of the head, and having the remaining portion of each leg bent to form a prong extending from the interior of the hollow head outwardly in close proximity to the other prong. v

5. A one piece sheet metal rivet having a hollow cupped head, legs formed upon and integral vwith the outer rimof the head, said legs each having a portion bent to extend toward the other into the interior of the cupped head and into abutting engagement with the inner curved surface of the head near the centerthereof, said legs having the remaining portions thereof bent to form prongs curved in cross section and extending from the interior ofthecupped head outwardly in close proXimityto each other, said prongs having their juncture with the remaining portion of the legs stiffened by extending the cross sectional curve of the prongs to said juncture.

In testimony whereof, I have signed my name to this specification.

ROY W. HAYNES. 

